Marxism is our nation's most serious threat.
Corollary: All Marxists lie.
Yep they do for that is a requirement to survive as a Marxist.
One doesn't have to be a Marxist to be a liar however....
As Hitler explained in Mein Kampf:
The size of a lie is a definite factor in causing it to be believed, for the vast masses of a nation are in the depths of their hearts more easily deceived than consciously and intentionally bad. The primitive simplicity of their minds renders them a more easy prey to a big lie than a small one, for they themselves often tell little lies but would be ashamed to tell big ones.